A是B的1/4C是B的1/2则A:B:C=():():()
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A是B的1/4C是B的1/2则A:B:C=():():()
A是B的1/4C是B的1/2则A:B:C=():():()
A是B的1/4C是B的1/2则A:B:C=():():()
A=1/4B 4A=B
C=1/2B 2C=B
4A=B=2C
A:B:C=1:4:2